Harry Blamires: A Guide to Twentieth Century Literature in English (1983)

Frederick Karl: American Fictions 1940-80 (1983)

Harvard: Guide to Contemporary American Writing (1979)

Not recommended:

Oxford: A Reader's Guide to the Twentieth-Century Novel (1995)

Oxford: A Reader's Guide to Twentieth-Century Writers (1995)

(Despite the ambitious scope, these are mostly British surveys with little
attention to non-British literature in English, particularly American, but also Australian, African, Indian, etc. Furthermore, they place
a disproportionate emphasis on homosexual and feminist writing, and display
a bias towards left-wing political writers).